Apparatus for measuring electric currents



June 29 1926.

' J. FRITZ APPARATUS FOR MEASURING ELECTRIC CURRENTS Filed Feb. 9,1924

m n mb d f 4 A, f e/J Patented June 29, 1926'.

.UN-ITED STATES" PATENT OFFICE.

JosEE ERIrz, 0E DREsDEN-sTREHLEN, GERM NY, ASSIGNOR r0 sAcHsENwERx, LICHT- m) KRAFT-AKTIENGESELLSCHAFT, or NIEDERSEDLITZ, N. /DRESDEN,

our, GERMANY.

rrARA'rUs EoR mEAsURmG ELECTRIC oURREN'rsr Application filed rebru'ar'ye, 1924, Serial No. 691,805, and in Germany December 24, 1923.

in connection with high voltage is a very expensive apparatus.

Now, the ob ect of the present invention is the provision of a measuring apparatus conductor. The transformer coil 1) iswound which is short-circuit proof and, at the same time, of a very cheap and simple construction.

The drawing shows in a diagrammatic sectional elevation one embodiment of my invention. e

This apparatus consists of a current indicator a and a current-transformer coil 6 neither of which is grounded but both of which are directly connected to the high tension line 0. As indicated in the drawing, this high tension line 0 is a tubular conductor. It will be understood however, that the invention is not limited to this type of conductor as it may be utilized with a solid with turns d of the indicator line 6 which at one end is connected to a terminal 7 on acollar g carried by and electrically connected to the high tension line a, indicator line 6 being carried through the hollow high tension line a, and at itsother end connected to one of the terminals of the ampere meter 1;. he other terminal of the ampere meter at, is connected by an indicator line h which terminates at'a contact 11 carried by a collar 7'. Electrically connected to the high tension line 0 also as indicated in the drawing, the ampere meter a may be mounted on an insulating collar or bracket is carried by the high tension line a. It will be obvious however, that in instances where the invention is applied with high tension lines not sulfici'ently strong to support the ampere meter and the transformer coil that these members may be suitably mounted on any adequate support in conjunction with the high tension line. I 1

lhe mode of operation of the apparatus described is the same as that of a shortcircuit proof connecting current transformer with an ampere meter. The difference between them consists 1n dispensing with the expensive insulation otherwise necessary between the transformer coil 6 and the high- I tension line, which insulation had; to be measured or defined for the total workingvoltage in the construction as heretofore used. f

I claim as my invention:

1. An apparatus for measuring electric currents comprising a high tension line, a current indicator, a transformer core associ- 1 ated with the" high tension line, and a conductor connected at its ends to the high tension line passing around the said trans formercore and Wltll which conductor the said current indicator is connected.

2. An apparatus for measuring electric currents comprising a hollow high tension line, an ampere meter, a transformer core on the high tension line, and a conductor connected at its ends to the high tension line at spaced points having a portion passing around the said transformer core and with which conductor the said ampere meter is connected. 4

3. An apparatus for measuring electric currents comprising a hollow high tension line, an ampere meter, a, support of insulating material carried by the high tension line and upon which the said ampere meter is mounted, a transformer core surround-' ing the said high tension line and an indicator conductor secured at its ends to the hightension line at spaced points having a portion thereof surrounding the said trans- JOSEF nrrzi 

